Comparison the effect of biologic fertilizer with chemical on oil sunflower (helianthus annus) in Arak condition

This is noticeable that insoluble phosphorus in the soil and some of bacterium has not capability of release insoluble phosphorus. This study was performed in order to study the effect of the release bacteria sunflower (helianthus annus). This experiment performed in RCBD based on a factorial design with 4 replications. This research was performed in the research farm of Arak Islamic Azad University during 2008. Factors were considered as two level Bacteria (B1: use Biologic phosphorus), (B2: no use Biologic phosphorus) and four level (P1; 150 kg/ha Ammonium phosphate), (P2; 300 kg/ha Ammonium phosphate), (P3; 150 kg/ha Triple phosphate super) and (P4: 300 kg/ha triple phosphate super). The results showed that using mixture of biologic phosphorus and Ammonium phosphate caused to improve planted sunflower. Characteristic such as weight of 1000 seeds, the number of seeds per head, yield of seed per hectare, head diameter, harvest index and biomass yield noticeable increase. Interaction of phosphorus and bacteria except in the empty percent and oil percent in the other characteristic was signification on the whole. Totally, results showed that by using released bacteria we can reduce phosphorus fertilizer by 50% without any significant reduction of yield.